We have two netbackup appliance 3.1.1, 5240 in two datacenters one virtulized NBU-master with 8.11. Installation is rather straigth. This problem is somehow related to vmware backup. A bit of the setup for that policy:

letsay one databox called dc007 (the faulty one) and dc008 (the goodone)

Performed below steps:On the Master, run services.msc and locate NetBackup Web Management Console service (nbwmc)Identify the account used to start the nbwmc serviceLocate / Acquire the password for this accountOpen an Administrator CMD prompt on the MasterCreate the following Environment Variable for the CMD window by running: set WEBSVC_PASSWORD=<passwordHere>Run: ...\NetBackup\bin\admincmd\nbcertconfig -t (use -t -f for NBU 8.1.1 and newerNOTE: If this fails, it is likely to be due to an incorrect password.To verify the password is correct, use the following command to spawn a new CMD window running as the account in question: runas /user:<user> cmd.exeExample local account : runas /user:nbwebsvc cmd.exeExample domain account: runas /user:COMPANY\nbwebsvc cmd.exeIf the new CMD window opens successfully, it means the credentials were correct - the new window can simply be closedIf the new CMD window fails to open, examine the on-screen language to identify whyCD into ...\NetBackup\wmc\bin\installRun: configureCerts.batRestart the nbwmc serviceRun: nbcertcmd -getCACertificateRun: nbcertcmd -getCertificate –force

REFERENCE:Please refer to the Customer Portal for related articles attached to your case.

Performed below steps:On the Master, run services.msc and locate NetBackup Web Management Console service (nbwmc)Identify the account used to start the nbwmc serviceLocate / Acquire the password for this accountOpen an Administrator CMD prompt on the MasterCreate the following Environment Variable for the CMD window by running: set WEBSVC_PASSWORD=<passwordHere>Run: ...\NetBackup\bin\admincmd\nbcertconfig -t (use -t -f for NBU 8.1.1 and newerNOTE: If this fails, it is likely to be due to an incorrect password.To verify the password is correct, use the following command to spawn a new CMD window running as the account in question: runas /user:<user> cmd.exeExample local account : runas /user:nbwebsvc cmd.exeExample domain account: runas /user:COMPANY\nbwebsvc cmd.exeIf the new CMD window opens successfully, it means the credentials were correct - the new window can simply be closedIf the new CMD window fails to open, examine the on-screen language to identify whyCD into ...\NetBackup\wmc\bin\installRun: configureCerts.batRestart the nbwmc serviceRun: nbcertcmd -getCACertificateRun: nbcertcmd -getCertificate –force

REFERENCE:Please refer to the Customer Portal for related articles attached to your case.